Sahih Muslim Book 006, Hadith Number 2586.

Chapter : The fasts observed by the Apostle of Allah (may peace be upon him) besides Ramadhan.

Anas (Allah be pleased with him) reported that the Messenger of Allah (may peace be upon him) used to observe fast till it was said that he had observed fast, he had observed fast (perhaps never to break it), and he did not fast till it was said that he had given up fast, he had given up fast (perhaps never to observe it).

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